Lake Zug (German: Zugersee) is a lake in Central Switzerland, situated between Lake Lucerne and Lake Zurich. It stretches for 14 km between Arth and the Cham-Zug bay. The Lorze as the main feeder river empties its waters into the lake at its northern extremity, but 1 km (0.6 mi) further west issues from the lake to pursue its course towards the Reuss.